chore: core 多模块骨架

IosClientKit/Sources/CoreDomain/HomeUseCase.swift

@@ -0,0 +1,16 @@
+import CoreModel
+
+/// 获取 Home 数据的用例。
+/// Kotlin: class HomeUseCase(...) { suspend operator fun invoke(): HomeData }
+public struct HomeUseCase: Sendable {
+    private let repository: HomeRepository
+
+    public init(repository: HomeRepository) {
+        self.repository = repository
+    }
+
+    /// Kotlin: Flow<HomeData> → Swift: AsyncThrowingStream<HomeData, Error>
+    public func observeHome() -> AsyncThrowingStream<HomeData, Error> {
+        repository.observeHome()
+    }
+}